Again, building a one-off is easier than a consumer-ready working system deployed across millions of locations that is owned by no central authority and has to run continually. That's why we had SHRDLU (https://www.youtube.com/watch?v=QAJz4YKUwqw and http://hci.stanford.edu/winograd/shrdlu/) and The Mother of All Demos (https://www.youtube.com/watch?v=yJDv-zdhzMY) years ahead of their time. That was my point.